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Commit | Line | Data |
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86166b7b JK |
1 | /* |
2 | * HID raw devices, giving access to raw HID events. | |
3 | * | |
4 | * In comparison to hiddev, this device does not process the | |
5 | * hid events at all (no parsing, no lookups). This lets applications | |
6 | * to work on raw hid events as they want to, and avoids a need to | |
7 | * use a transport-specific userspace libhid/libusb libraries. | |
8 | * | |
9 | * Copyright (c) 2007 Jiri Kosina | |
10 | */ | |
11 | ||
12 | /* | |
13 | * This program is free software; you can redistribute it and/or modify it | |
14 | * under the terms and conditions of the GNU General Public License, | |
15 | * version 2, as published by the Free Software Foundation. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License along with | |
18 | * this program; if not, write to the Free Software Foundation, Inc., | |
19 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
20 | */ | |
21 | ||
22 | #include <linux/fs.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/errno.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/init.h> | |
27 | #include <linux/cdev.h> | |
28 | #include <linux/poll.h> | |
29 | #include <linux/device.h> | |
30 | #include <linux/major.h> | |
5a0e3ad6 | 31 | #include <linux/slab.h> |
86166b7b JK |
32 | #include <linux/hid.h> |
33 | #include <linux/mutex.h> | |
a99bbaf5 | 34 | #include <linux/sched.h> |
702e57d9 | 35 | #include <linux/smp_lock.h> |
86166b7b JK |
36 | |
37 | #include <linux/hidraw.h> | |
38 | ||
39 | static int hidraw_major; | |
40 | static struct cdev hidraw_cdev; | |
41 | static struct class *hidraw_class; | |
42 | static struct hidraw *hidraw_table[HIDRAW_MAX_DEVICES]; | |
7d672cd7 | 43 | static DEFINE_MUTEX(minors_lock); |
86166b7b JK |
44 | |
45 | static ssize_t hidraw_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos) | |
46 | { | |
47 | struct hidraw_list *list = file->private_data; | |
48 | int ret = 0, len; | |
86166b7b JK |
49 | DECLARE_WAITQUEUE(wait, current); |
50 | ||
b0e14951 | 51 | mutex_lock(&list->read_mutex); |
86166b7b | 52 | |
b0e14951 | 53 | while (ret == 0) { |
86166b7b JK |
54 | if (list->head == list->tail) { |
55 | add_wait_queue(&list->hidraw->wait, &wait); | |
56 | set_current_state(TASK_INTERRUPTIBLE); | |
57 | ||
58 | while (list->head == list->tail) { | |
59 | if (file->f_flags & O_NONBLOCK) { | |
60 | ret = -EAGAIN; | |
61 | break; | |
62 | } | |
63 | if (signal_pending(current)) { | |
64 | ret = -ERESTARTSYS; | |
65 | break; | |
66 | } | |
67 | if (!list->hidraw->exist) { | |
68 | ret = -EIO; | |
69 | break; | |
70 | } | |
71 | ||
72 | /* allow O_NONBLOCK to work well from other threads */ | |
73 | mutex_unlock(&list->read_mutex); | |
74 | schedule(); | |
75 | mutex_lock(&list->read_mutex); | |
76 | set_current_state(TASK_INTERRUPTIBLE); | |
77 | } | |
78 | ||
79 | set_current_state(TASK_RUNNING); | |
80 | remove_wait_queue(&list->hidraw->wait, &wait); | |
81 | } | |
82 | ||
83 | if (ret) | |
84 | goto out; | |
85 | ||
86166b7b JK |
86 | len = list->buffer[list->tail].len > count ? |
87 | count : list->buffer[list->tail].len; | |
88 | ||
89 | if (copy_to_user(buffer, list->buffer[list->tail].value, len)) { | |
90 | ret = -EFAULT; | |
91 | goto out; | |
92 | } | |
93 | ret += len; | |
94 | ||
95 | kfree(list->buffer[list->tail].value); | |
96 | list->tail = (list->tail + 1) & (HIDRAW_BUFFER_SIZE - 1); | |
97 | } | |
98 | out: | |
99 | mutex_unlock(&list->read_mutex); | |
100 | return ret; | |
101 | } | |
102 | ||
103 | /* the first byte is expected to be a report number */ | |
104 | static ssize_t hidraw_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) | |
105 | { | |
106 | unsigned int minor = iminor(file->f_path.dentry->d_inode); | |
2e57480b | 107 | struct hid_device *dev; |
86166b7b JK |
108 | __u8 *buf; |
109 | int ret = 0; | |
110 | ||
2e57480b | 111 | mutex_lock(&minors_lock); |
e42dee9a AO |
112 | |
113 | if (!hidraw_table[minor]) { | |
114 | ret = -ENODEV; | |
115 | goto out; | |
116 | } | |
117 | ||
2e57480b JK |
118 | dev = hidraw_table[minor]->hid; |
119 | ||
120 | if (!dev->hid_output_raw_report) { | |
121 | ret = -ENODEV; | |
122 | goto out; | |
123 | } | |
86166b7b | 124 | |
2b107d62 | 125 | if (count > HID_MAX_BUFFER_SIZE) { |
86166b7b | 126 | printk(KERN_WARNING "hidraw: pid %d passed too large report\n", |
ba25f9dc | 127 | task_pid_nr(current)); |
2e57480b JK |
128 | ret = -EINVAL; |
129 | goto out; | |
86166b7b JK |
130 | } |
131 | ||
132 | if (count < 2) { | |
133 | printk(KERN_WARNING "hidraw: pid %d passed too short report\n", | |
ba25f9dc | 134 | task_pid_nr(current)); |
2e57480b JK |
135 | ret = -EINVAL; |
136 | goto out; | |
86166b7b JK |
137 | } |
138 | ||
139 | buf = kmalloc(count * sizeof(__u8), GFP_KERNEL); | |
2e57480b JK |
140 | if (!buf) { |
141 | ret = -ENOMEM; | |
142 | goto out; | |
143 | } | |
86166b7b JK |
144 | |
145 | if (copy_from_user(buf, buffer, count)) { | |
146 | ret = -EFAULT; | |
2e57480b | 147 | goto out_free; |
86166b7b JK |
148 | } |
149 | ||
d4bfa033 | 150 | ret = dev->hid_output_raw_report(dev, buf, count, HID_OUTPUT_REPORT); |
2e57480b | 151 | out_free: |
86166b7b | 152 | kfree(buf); |
2e57480b JK |
153 | out: |
154 | mutex_unlock(&minors_lock); | |
86166b7b JK |
155 | return ret; |
156 | } | |
157 | ||
158 | static unsigned int hidraw_poll(struct file *file, poll_table *wait) | |
159 | { | |
160 | struct hidraw_list *list = file->private_data; | |
161 | ||
162 | poll_wait(file, &list->hidraw->wait, wait); | |
163 | if (list->head != list->tail) | |
164 | return POLLIN | POLLRDNORM; | |
165 | if (!list->hidraw->exist) | |
166 | return POLLERR | POLLHUP; | |
167 | return 0; | |
168 | } | |
169 | ||
170 | static int hidraw_open(struct inode *inode, struct file *file) | |
171 | { | |
172 | unsigned int minor = iminor(inode); | |
173 | struct hidraw *dev; | |
174 | struct hidraw_list *list; | |
175 | int err = 0; | |
176 | ||
177 | if (!(list = kzalloc(sizeof(struct hidraw_list), GFP_KERNEL))) { | |
178 | err = -ENOMEM; | |
179 | goto out; | |
180 | } | |
181 | ||
7d672cd7 | 182 | mutex_lock(&minors_lock); |
86166b7b | 183 | if (!hidraw_table[minor]) { |
86166b7b JK |
184 | kfree(list); |
185 | err = -ENODEV; | |
186 | goto out_unlock; | |
187 | } | |
188 | ||
189 | list->hidraw = hidraw_table[minor]; | |
190 | mutex_init(&list->read_mutex); | |
191 | list_add_tail(&list->node, &hidraw_table[minor]->list); | |
192 | file->private_data = list; | |
193 | ||
194 | dev = hidraw_table[minor]; | |
7d672cd7 | 195 | if (!dev->open++) { |
0361a28d ON |
196 | if (dev->hid->ll_driver->power) { |
197 | err = dev->hid->ll_driver->power(dev->hid, PM_HINT_FULLON); | |
198 | if (err < 0) | |
199 | goto out_unlock; | |
200 | } | |
7d672cd7 | 201 | err = dev->hid->ll_driver->open(dev->hid); |
0361a28d ON |
202 | if (err < 0) { |
203 | if (dev->hid->ll_driver->power) | |
204 | dev->hid->ll_driver->power(dev->hid, PM_HINT_NORMAL); | |
7d672cd7 | 205 | dev->open--; |
0361a28d | 206 | } |
7d672cd7 | 207 | } |
86166b7b JK |
208 | |
209 | out_unlock: | |
7d672cd7 | 210 | mutex_unlock(&minors_lock); |
7d672cd7 | 211 | out: |
86166b7b JK |
212 | return err; |
213 | ||
214 | } | |
215 | ||
216 | static int hidraw_release(struct inode * inode, struct file * file) | |
217 | { | |
218 | unsigned int minor = iminor(inode); | |
219 | struct hidraw *dev; | |
220 | struct hidraw_list *list = file->private_data; | |
221 | ||
0a504541 | 222 | if (!hidraw_table[minor]) |
86166b7b | 223 | return -ENODEV; |
86166b7b JK |
224 | |
225 | list_del(&list->node); | |
226 | dev = hidraw_table[minor]; | |
b8a832b1 | 227 | if (!--dev->open) { |
0361a28d ON |
228 | if (list->hidraw->exist) { |
229 | if (dev->hid->ll_driver->power) | |
230 | dev->hid->ll_driver->power(dev->hid, PM_HINT_NORMAL); | |
c500c971 | 231 | dev->hid->ll_driver->close(dev->hid); |
0361a28d | 232 | } else { |
86166b7b | 233 | kfree(list->hidraw); |
0361a28d | 234 | } |
86166b7b JK |
235 | } |
236 | ||
4db1c62c JK |
237 | kfree(list); |
238 | ||
86166b7b JK |
239 | return 0; |
240 | } | |
241 | ||
979c407e AC |
242 | static long hidraw_ioctl(struct file *file, unsigned int cmd, |
243 | unsigned long arg) | |
86166b7b | 244 | { |
979c407e | 245 | struct inode *inode = file->f_path.dentry->d_inode; |
86166b7b | 246 | unsigned int minor = iminor(inode); |
979c407e | 247 | long ret = 0; |
2e57480b | 248 | struct hidraw *dev; |
86166b7b JK |
249 | void __user *user_arg = (void __user*) arg; |
250 | ||
2e57480b JK |
251 | mutex_lock(&minors_lock); |
252 | dev = hidraw_table[minor]; | |
d20d5ffa AO |
253 | if (!dev) { |
254 | ret = -ENODEV; | |
255 | goto out; | |
256 | } | |
2e57480b | 257 | |
86166b7b JK |
258 | switch (cmd) { |
259 | case HIDIOCGRDESCSIZE: | |
260 | if (put_user(dev->hid->rsize, (int __user *)arg)) | |
979c407e AC |
261 | ret = -EFAULT; |
262 | break; | |
86166b7b JK |
263 | |
264 | case HIDIOCGRDESC: | |
265 | { | |
266 | __u32 len; | |
267 | ||
268 | if (get_user(len, (int __user *)arg)) | |
979c407e AC |
269 | ret = -EFAULT; |
270 | else if (len > HID_MAX_DESCRIPTOR_SIZE - 1) | |
271 | ret = -EINVAL; | |
272 | else if (copy_to_user(user_arg + offsetof( | |
273 | struct hidraw_report_descriptor, | |
274 | value[0]), | |
275 | dev->hid->rdesc, | |
276 | min(dev->hid->rsize, len))) | |
277 | ret = -EFAULT; | |
278 | break; | |
86166b7b JK |
279 | } |
280 | case HIDIOCGRAWINFO: | |
281 | { | |
282 | struct hidraw_devinfo dinfo; | |
283 | ||
284 | dinfo.bustype = dev->hid->bus; | |
285 | dinfo.vendor = dev->hid->vendor; | |
286 | dinfo.product = dev->hid->product; | |
287 | if (copy_to_user(user_arg, &dinfo, sizeof(dinfo))) | |
979c407e AC |
288 | ret = -EFAULT; |
289 | break; | |
86166b7b JK |
290 | } |
291 | default: | |
9188e79e JK |
292 | { |
293 | struct hid_device *hid = dev->hid; | |
dfd395af DC |
294 | if (_IOC_TYPE(cmd) != 'H' || _IOC_DIR(cmd) != _IOC_READ) { |
295 | ret = -EINVAL; | |
296 | break; | |
297 | } | |
9188e79e JK |
298 | |
299 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWNAME(0))) { | |
300 | int len; | |
38089c65 DC |
301 | if (!hid->name) { |
302 | ret = 0; | |
303 | break; | |
304 | } | |
9188e79e JK |
305 | len = strlen(hid->name) + 1; |
306 | if (len > _IOC_SIZE(cmd)) | |
307 | len = _IOC_SIZE(cmd); | |
dfd395af | 308 | ret = copy_to_user(user_arg, hid->name, len) ? |
9188e79e | 309 | -EFAULT : len; |
dfd395af | 310 | break; |
9188e79e JK |
311 | } |
312 | ||
313 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWPHYS(0))) { | |
314 | int len; | |
38089c65 DC |
315 | if (!hid->phys) { |
316 | ret = 0; | |
317 | break; | |
318 | } | |
9188e79e JK |
319 | len = strlen(hid->phys) + 1; |
320 | if (len > _IOC_SIZE(cmd)) | |
321 | len = _IOC_SIZE(cmd); | |
dfd395af | 322 | ret = copy_to_user(user_arg, hid->phys, len) ? |
9188e79e | 323 | -EFAULT : len; |
dfd395af | 324 | break; |
9188e79e | 325 | } |
81cd5843 | 326 | } |
9188e79e | 327 | |
dfd395af | 328 | ret = -ENOTTY; |
86166b7b | 329 | } |
d20d5ffa | 330 | out: |
2e57480b | 331 | mutex_unlock(&minors_lock); |
979c407e | 332 | return ret; |
86166b7b JK |
333 | } |
334 | ||
335 | static const struct file_operations hidraw_ops = { | |
336 | .owner = THIS_MODULE, | |
337 | .read = hidraw_read, | |
338 | .write = hidraw_write, | |
339 | .poll = hidraw_poll, | |
340 | .open = hidraw_open, | |
341 | .release = hidraw_release, | |
979c407e | 342 | .unlocked_ioctl = hidraw_ioctl, |
86166b7b JK |
343 | }; |
344 | ||
345 | void hidraw_report_event(struct hid_device *hid, u8 *data, int len) | |
346 | { | |
347 | struct hidraw *dev = hid->hidraw; | |
348 | struct hidraw_list *list; | |
349 | ||
350 | list_for_each_entry(list, &dev->list, node) { | |
351 | list->buffer[list->head].value = kmemdup(data, len, GFP_ATOMIC); | |
352 | list->buffer[list->head].len = len; | |
353 | list->head = (list->head + 1) & (HIDRAW_BUFFER_SIZE - 1); | |
354 | kill_fasync(&list->fasync, SIGIO, POLL_IN); | |
355 | } | |
356 | ||
357 | wake_up_interruptible(&dev->wait); | |
358 | } | |
359 | EXPORT_SYMBOL_GPL(hidraw_report_event); | |
360 | ||
361 | int hidraw_connect(struct hid_device *hid) | |
362 | { | |
709d27c0 | 363 | int minor, result; |
86166b7b JK |
364 | struct hidraw *dev; |
365 | ||
bbe281fa | 366 | /* we accept any HID device, no matter the applications */ |
86166b7b | 367 | |
709d27c0 MK |
368 | dev = kzalloc(sizeof(struct hidraw), GFP_KERNEL); |
369 | if (!dev) | |
370 | return -ENOMEM; | |
371 | ||
372 | result = -EINVAL; | |
86166b7b | 373 | |
7d672cd7 | 374 | mutex_lock(&minors_lock); |
86166b7b JK |
375 | |
376 | for (minor = 0; minor < HIDRAW_MAX_DEVICES; minor++) { | |
377 | if (hidraw_table[minor]) | |
378 | continue; | |
379 | hidraw_table[minor] = dev; | |
380 | result = 0; | |
381 | break; | |
382 | } | |
383 | ||
709d27c0 | 384 | if (result) { |
7d672cd7 | 385 | mutex_unlock(&minors_lock); |
709d27c0 | 386 | kfree(dev); |
86166b7b | 387 | goto out; |
709d27c0 | 388 | } |
86166b7b | 389 | |
aae6c286 | 390 | dev->dev = device_create(hidraw_class, &hid->dev, MKDEV(hidraw_major, minor), |
a9b12619 | 391 | NULL, "%s%d", "hidraw", minor); |
86166b7b JK |
392 | |
393 | if (IS_ERR(dev->dev)) { | |
86166b7b | 394 | hidraw_table[minor] = NULL; |
7d672cd7 | 395 | mutex_unlock(&minors_lock); |
86166b7b | 396 | result = PTR_ERR(dev->dev); |
709d27c0 | 397 | kfree(dev); |
86166b7b JK |
398 | goto out; |
399 | } | |
400 | ||
7d672cd7 | 401 | mutex_unlock(&minors_lock); |
86166b7b JK |
402 | init_waitqueue_head(&dev->wait); |
403 | INIT_LIST_HEAD(&dev->list); | |
404 | ||
405 | dev->hid = hid; | |
406 | dev->minor = minor; | |
407 | ||
408 | dev->exist = 1; | |
409 | hid->hidraw = dev; | |
410 | ||
411 | out: | |
412 | return result; | |
413 | ||
414 | } | |
415 | EXPORT_SYMBOL_GPL(hidraw_connect); | |
416 | ||
417 | void hidraw_disconnect(struct hid_device *hid) | |
418 | { | |
419 | struct hidraw *hidraw = hid->hidraw; | |
420 | ||
421 | hidraw->exist = 0; | |
422 | ||
7d672cd7 | 423 | mutex_lock(&minors_lock); |
86166b7b | 424 | hidraw_table[hidraw->minor] = NULL; |
7d672cd7 | 425 | mutex_unlock(&minors_lock); |
86166b7b JK |
426 | |
427 | device_destroy(hidraw_class, MKDEV(hidraw_major, hidraw->minor)); | |
428 | ||
429 | if (hidraw->open) { | |
c500c971 | 430 | hid->ll_driver->close(hid); |
86166b7b JK |
431 | wake_up_interruptible(&hidraw->wait); |
432 | } else { | |
433 | kfree(hidraw); | |
434 | } | |
435 | } | |
436 | EXPORT_SYMBOL_GPL(hidraw_disconnect); | |
437 | ||
438 | int __init hidraw_init(void) | |
439 | { | |
440 | int result; | |
441 | dev_t dev_id; | |
442 | ||
443 | result = alloc_chrdev_region(&dev_id, HIDRAW_FIRST_MINOR, | |
444 | HIDRAW_MAX_DEVICES, "hidraw"); | |
445 | ||
446 | hidraw_major = MAJOR(dev_id); | |
447 | ||
448 | if (result < 0) { | |
449 | printk(KERN_WARNING "hidraw: can't get major number\n"); | |
450 | result = 0; | |
451 | goto out; | |
452 | } | |
453 | ||
454 | hidraw_class = class_create(THIS_MODULE, "hidraw"); | |
455 | if (IS_ERR(hidraw_class)) { | |
456 | result = PTR_ERR(hidraw_class); | |
457 | unregister_chrdev(hidraw_major, "hidraw"); | |
458 | goto out; | |
459 | } | |
460 | ||
461 | cdev_init(&hidraw_cdev, &hidraw_ops); | |
462 | cdev_add(&hidraw_cdev, dev_id, HIDRAW_MAX_DEVICES); | |
463 | out: | |
464 | return result; | |
465 | } | |
466 | ||
140ae3eb | 467 | void hidraw_exit(void) |
86166b7b JK |
468 | { |
469 | dev_t dev_id = MKDEV(hidraw_major, 0); | |
470 | ||
471 | cdev_del(&hidraw_cdev); | |
472 | class_destroy(hidraw_class); | |
473 | unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES); | |
474 | ||
475 | } |